A STOPPED-FLOW MIXING DEVICE FOR THE SPECTROPHOTOMETRIC STUDY OF RAPID REACTIONS

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Abstract
A simplified stopped-flow mixing device, which has been adapted to a Beckman DU spectrophotometer, is described. Removable storage syringes are used to inject the required solutions into the apparatus, while the operations of filling the reaction syringes, mixing the reactants, or standardization are achieved with T-bore stopcocks. Provision has been made in the design for interchangeable mixing chambers and observation cells. The temperature is controlled by circulating water through a suitable enclosure surrounding the reaction syringes. A zero-suppression method has been devised to record the extent of reaction.